His family started the Facebook page "Save Josh" a few years ago while trying to convince a drug company to give him an experimental treatment for a virus he contracted during a bone marrow transplant. The page continued to share updates on Josh's story and encourage followers to support St. Jude Children's Research Hospital.

The post alerting followers of Josh's death was solemn, but it carried messages of hope.

"This is a time for heroes, the post read. "We will do what is hard. We will achieve what is great. We will do what is required. We will find a cure."

A day after his death, the group posted a photo of him smiling--a poignant reminder of the joy he spread around him wherever he went. The group also changed their profile picture to one of Josh posing in an army uniform--a fighter to the end.